Tap and reamer chuck



O. S. KALLMAN.

TAP AND REAMER CHUCK. APPLlCATlON Fl'LED FEB. 20. 1920.

Patented J uly 4, 1922.

2 SHEETS-SHEER l.

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0. S. KALLMAN. TAP AND REAMER CHUCK.

APPLICATION FILED FEB, 20, 1920. I

Patented Ju y 4, 1922. 2 SHEETS-SH EE- wwwtoz tibii TAP AND REAMER CHUCK.

Specification of Letters Patent.

Patented July 4, 1922.

Application filed February 20, 1920. Serial No. 360,240.

To all whom it may concern:

Be it known that I, OTTO S. KALLMAN, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Tap and Reamer Chucks, of which the following is a specification.

This invention relates to chucks, and the primaryobject of the invention is to provide an improved chuck especially adapted for holding taps and reamers, but which is capable of holding other tools, and which is so constructed that taps of various sizes may be held.

Another object of the invention is to provide an improved tap embodying an adjustable disc having a plurality of different sized square recesses formed therein, any one of which is adapted to be brought into alignment with the tap receiving opening, so that different sized taps having different sized squared terminals may be secured in the chuck.

A further object ofthe invention is the provision of a chuck having means for receiving the different sized squared terminals of taps and an improved means located below the means for receiving the squared tap terminals for adjustably engaging and clamping the shanks of thetaps.

A further object of theinvention is to provide an improved clamp which is capable of holding reamers used in hand work, the chuck body forming anefiicient handle for the reamer.

A still further object of the invention is to provide an improved chuck for holding taps and reamers of various sizes which is durable and eflicient in use, one that is simple and easy to manufacture, and one which can be placed upon the market at a reasonable cost.

Other objects and advantages of the invention will appear from the following detailed description, taken in connection with the drawings, forming a part of this specification, in which drawings: a

Figure 1 is an elevation of the improved chuck.

Figure 2 is a longitudinal vertical section through the chuck taken on the line -2-2 of Fi ure 1.

igure 3 is a bottom plan view of the chuck.

Figure 4 is a vertical longitudinal section V taining flange 17,

ed to receive the disc 22. The

through the chuck of Figure 2.

Figure 5 is a transverse section through the chuck taken on the line 55 of Figure 2.

Figure 6 is a transverse section through the chuck taken on the line 66 of Figure 2.

Figure 7 is a transverse section taken on the line 77 of Figure 2.

Figure 8 is a transverse section taken on the line 8-8 of F igure 2, and

Figure 9 is an enlarged detail elevation of the spring fingers for holding the jaws in operative position.

Referring to the drawings in detail, where in similar reference characters designate corresponding parts throughout the several views, the numeral 10 indicates the improved taken on the line 4.4=

chuck which includes the tapered shank 11 having the flattened terminal 12 of the ordinary configuration. The lower end of the shank 10 is adapted to be connected to the solid cylindrical body 13 of the chuck by a removable collar 14, which includes an annular attaching flange 15, which is adapted to be secured to the chuck body 13 by suitable fastening elements such as screws 16. The collar 14 is provided withan inwardly extending annular peripheral rewhich is adapted to engage the outer surface of the annular rib 18 formed on the lower end of the tapered.

shank 11. The extreme lower end of the tapered shank 11 is provided with a depending polygonal nose 19, which is adapted to lit in a polygonal opening-'20 formed in the upper face of the chuck body 13. at the cen tral portion thereof. The chuck body 13 intermediate its ends is provided with a diametrically extending slot 21, which is adaptperiphery of the disc 22 is provided with a. plurality of inwardly extending polygonal recesses 23, any one of which is adapted to be brought into alignment with the longitudinally extending bore 24 formed in the chuck body. The different sized recesses 23 formed in the periphery of the disc 22am adapted to re ceive the squared terminals of the taps and the like, and by mounting the disc so that any one of the recesses may be brought into alignment with the bore 24 of the body, various sized taps can be accommodated.

The disc 22' is rotatably mounted in the chuck body 13 by meansof a diametrically extending pin or shaft 25, which has its terminals rotatably mounted in suitable for rotatably supporting the pin rovided' with a slot 31 TheIsleeVe 32 forms means the accidental displacement of the pin or openings 26 formed in the chuck body. The

disc 22 is provided with a concentric open:

ing'27 for the receptionof the. pin or shaft 25 and the disc is secured to the pin or shaft bya'suitable key 28. One terminal of the p'ino'r shaft 25 is provided with an enlarged head 29 which is fittedin theenlarged portion 30 ofone of the openings 26 provided or shaft 25. The head 29 of the pin or, shaft 25' is of a screw driver or the like so as to permit the pin or shaft to. be turned for bringing-any one of the desired recesses 23 into alignment with the bore 24. The outer surface of the body 13 isprovided with a casing for sleeve 32', which is secured to the body by suitable removable fastening elements 33.

shaft 25. The sleeve 32 is provided with an opening 34 which is in direct alignment 1 form to the recesses 23 formed in the peripheryof'thei disc 22,-and the thesize of the said recesses. head 29 and bringing the mark indicating marks indicate By rotating the the desired size of the recess to be used in connection with the tap into direct alignv mentwiththe indicator 35, the 'said'recess is brought into registration with the bore 24 0f the chuck body 13.

A leafspring'37 is provided for holding the disc 22 against accidental turning movement in the chuck body when one of there- 'cesses 23 has been brought into registration with the bore 24. The spring'37 has its lower end provided with an inwardly extending tooth 38 which is adapted to de- -tachably fit in any one'of :a plurality-of notches 39 formed in the periphery of the disc 22.

l A notch 39 .is provided for each one of therecesses so as'toeffectively hold -jany one of the recesses in'alignment with ithe'bore 24. The upper end of the spring 37 is-provided with an angular attaching 7 foot 40 which is secured to the upper wall of the slot 21'bya suitableremovable 'fastening element 41. V- 1 a V The chuck body 13 is provided with aplurality of radially extending slots 42 ewhichv extend outwardly [these slots 42' are adapted to snugly receive from the bore 24 and thejjaws 42which are adapted to engage and I clamp the shankof a tap,

tap against accidental displacement from to firmly hold a 47 provided for the reception 7 fastening elements 48, which extend into the for preventing 'ofcthe adjusting ring 51 may with suitable inwardly extending openings the chuck body. Each of the jaws 42 is pivotally mountedupo'n a pin 43 which extends through the jaw and into the chuck body. "Theportions of the jaws 42 extending above thepivot pins 43 are provided with inclined outer surfaces 44; which are adapted to be engaged by the inner endsof leaf springs 45', which are provided with enlarged attaching feet 46, having openings therein for the reception of chuck body; swing the jaws 7 hold the'lower ends thereof out of. the bore 24. 'The jaws 42 directly below the pivot pins 43 are notched as at 49 and The leaf springs 45 tend to groove 50 formed in the chuck body 113. The inner wall of the annular groove 50 is provided with threads on whichisfitted the internally threaded ring 51, whiclrforms means for moving the lower end of the jaws 42 intothe bore 24 against the tension-of the leaf springc45. The inner surface of the jaws 42 adjacent to the lower ends thereof are provided with inwardly extending jaw faces 52 which may be serrated if so desired for engaging a shank of a'tap. The outer surface of the jaws421-directlyin rear of the: jaw faces 52 are, provided with downwardly and outwardly inclined shoulders 53 42 on the pivot pins 43 and these notches extend in d rect alignment with the annular which are adapted tobe engaged by the lowerconical wall 54 formed on the inner surface of the adjusting ring 51. It can the aw faces52 into bore 24 for engaging 10 be provided a tap positioned therein. 7 The-outer surface 55 for the receptioniof aspanner wrench to facilitate the turningthereof, or the entire outer surface ofthe ring can be -serrated or. mllled so asto permit a firm l10lCl1'tO:l) obtained thereonby the hand ofthe user; A

cap 56 isprovided for the lower end of the body and is detachably securedtheretogby inwardly extending fastening elements 57; The lower wall of the cap is provided with a concentric opening 58, whichis in direct alignment with the bore. 24v ofri'the chuck v V 'body13;

In operation of the improved chuck the ring 51 1s rotatedin the desired direction so as'to retract the jaw faces 52out ofvthe bore 24 and'the disc 22 is rotated by means; 7

of theslot-31 of the head 29 "ofthe pin 25 until'a recess 23 of the desired size is brought into alignment with the bore 24. V 'Artool is then insertedin the bore and the square end thereof is inserted into theopening 23.; The; rino- 51 is then'turned'in aireverse'directionr so as to forcc'the jaw faces 52 of the jaws 42 into tight engagement with the shank of the tool to prevent accidental displacement thereof. The shank of the chuck is then inserted into the machine in the ordinary manner.

From the foregoing description it can be seen that an improved chuck is provided for holding taps of various sizes which is of exceedingly durable and eflicient construction and which will eiiectively accomplish the purpose intended.

Changes in details may be made without departing from the spirit or scope of the invention; but,

I claim:

l. A chuck, comprising a body having a tool shank receiving opening formed therein, means arranged in the body having a plurality of difi'erent sized openings therein arranged to receive the inner ends of a tool shank, and means carried by said body and projecting into said tool shank receiving opening therein, for clamping a tool.

2. An improved chuck comprising a body having a tool shank receiving opening formed therein, the body having-a diametrically extending slot formed therein directly above the bore, a pin rotatably mounted in the body and extending through said slot, a disc keyed to said pin havinga plurality ofdifi'erent sized polygonal openings formed in the periphery thereof, means for turning the pin for r0- tating the disc to bring any one of the openings formed therein into alignment with the tool shank receiving opening, the disc havin a plurality of spaced notches, a leaf spring carried-by the body, and a tooth formed on the leaf spring for engaging in any one of the notches.

3. A chuck comprising a body having a tool receiving opening formed therein, a member rotatably mounted in the body having a plurality of different sized polygonal openings formed therein arranged to be brought into registration with the tool receiving opening, and adjustable jaws carried by the body and arranged to be brought into and out of the tool receiving opening below the rotatable member. 7

4. A chuck comprising a body having a tool shank receiving opening formed therein, a rotatable member arranged in the body having a plurality of different sized polygonal openings formed therein arranged to be brought into alignment with the tool shank receiving openings, a plurality of pivoted jaws carried by the body and arranged below the rotatable member, the jaws being adapted to extend into the tool shank receiving opening, and means for adjusting the jaws in relation to the tool shank receiving opening 5. An improved chuck comprising a body having a tool shank receiving opening formed therein, a member rotatably mounted in the body having a plurality of polygonal openings formed in the periphery thereof arranged to be brought into alignment with the tool shank receiving opening, a plurality of pivoted jaws carried by the body arranged below the rotatable member, said jaws being adapted toVeXtend into the tool shank receiving opening, spring means engaging the jaws to normally hold the same out of the tool shank receiving opening, and means for moving the jaws into the tool shank receiving opening.

6. A chuck comprising a body having a diametrically extending slot formed therein, a'pin rotatably carried by the body and extending through the slot, a disc keyed to the pin having a plurality of different sized polygonal openings formed in the periphery thereof, a plurality of pivoted jaws arranged below the disc, a sleeve arranged around the body, the lower end of the body being reduced and externally screw threaded, the lower terminals of the jaws having inclined outer faces, and a ring fitted on said threaded reducedterminal of the body and arranged to engage the inclined faces of the 7. A chuck comprising a body portion having a tool receiving opening therein, a disc having a plurality of different sized tool receiving recesses in its periphery, a shaft keyed to said disc and rotatably supported within said body portion, in suclr manner that any one of said recesses in said disc may align with said body opening, jaws pivoted within said body, and means for advancing said jaws to project into said body opening for clamping a tool.

OTTO S. KALLMAN. 

